CN106662704A - Optical fiber and optical fiber transmission path - Google Patents
Optical fiber and optical fiber transmission path Download PDFInfo
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- CN106662704A CN106662704A CN201580040536.9A CN201580040536A CN106662704A CN 106662704 A CN106662704 A CN 106662704A CN 201580040536 A CN201580040536 A CN 201580040536A CN 106662704 A CN106662704 A CN 106662704A
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- refractive index
- central core
- inner cladding
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
- G02B6/02014—Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm
- G02B6/02019—Effective area greater than 90 square microns in the C band, i.e. 1530-1565 nm
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03605—Highest refractive index not on central axis
- G02B6/03611—Highest index adjacent to central axis region, e.g. annular core, coaxial ring, centreline depression affecting waveguiding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/23—Double or multiple optical cladding profiles
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/24—Single mode [SM or monomode]
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Optical Communication System (AREA)
Abstract
The present embodiment relates to an optical fiber having a W-type refractive index distribution or a trench-type refractive index distribution, in which microbend loss is reduced in the wavelength range of actual use. This optical fiber is provided with a central core, an inner cladding for surrounding the central core, and an outer cladding for surrounding the inner cladding. The inner cladding has a refractive index lower than the refractive index of at least the central core, and the outer cladding has a refractive index lower than the refractive index of the central core and higher than the refractive index of the inner cladding. The wavelength dependency of microbend loss has a maximum value, and the shortest wavelength lambda th at which the microbend loss is 10% of the maximum value is greater than 1560 nanometers.
Description
Technical field
The present invention relates to a kind of optical fiber and optical fiber transmission line.
Background technology
In optical communication system, optical fiber transmission line is used as the optical transmission line of transmission signal light.In addition, in optic communication system
In signal optical transport (especially digital coherent transmission) in system, need to improve OSNR (OSNR).Accordingly, it would be desirable to reduce structure
Make as the loss of at least one of optical fiber of optical fiber transmission line and non-linear.In order to reduce the non-linear of optical fiber, effectively
Be increase optical fiber effective cross section product.For example, as it is known that a kind of effective cross section product increases to 110 μm2Optical fiber above.
However, obtaining in the optical fiber for increasing in effective cross section product, the limit that light (basic mode light) is limited at core will be propagated
System dies down.In this case, microbending loss tends to increase.As a result, OSNR may decline.Microbending loss is the propagation base because of core
Mould causes light leakage and then increases the phenomenon of loss with covering mode coupling, and known microbending loss is by because applying to optical fiber
Plus transverse pressure and random micro-bend causing of occurring.
Non-patent literature 1 describes microbending loss.According to the description of non-patent literature 1, with notch cuttype refractive index point
In the single-mode fiber of cloth, microbending loss exponentially increases with regard to wavelength.In addition, according to the description of non-patent literature 1, with ditch
It is micro- in the case of basic mode is coupled to form as tunnelling ray because random micro-bend with higher mode in the optical fiber of grooved index distribution
Curved loss is relative constancy with regard to wavelength, and the optical fiber with groove-shaped index distribution has the core being sequentially arranged from center
Portion, the first covering, the second covering and triple clad.The refractive index of core is higher than the refractive index of the first covering and triple clad, and
And second covering refractive index less than the first covering and triple clad refractive index.
Reference listing
Non-patent literature
Non-patent literature 1：" the Micro-Bend Losses of of Pierre Sillard (Pi Aier West Asias that) et al.
Trench-Assisted Single-Mode Fibers (microbending loss of groove auxiliary type single-mode fiber) "
ECOC2010We.8.F.3
The content of the invention
Technical problem
The present inventor is had studied based on the optical fiber of prior art, and consequently found that problems with.That is, W types folding
It is considered as the index distribution that can increase the optical fiber that effective cross section is accumulated to penetrate rate distribution and groove-shaped index distribution.Pass through
W type index distributions are obtained using each region of central core, inner cladding and surrounding layer composition optical fiber, wherein, inner cladding bag
Enclose central core and there is the refractive index lower than the refractive index of central core；Surrounding layer surrounds inner cladding and has than central core
The refractive index that refractive index is low but refractive index of than inner cladding is high.Non-patent literature 1 is not described can increase effective cross section product
Optical fiber microbending loss wavelength dependence.
Complete the present invention to solve the above problems, and a kind of it is an object of the invention to provide optical fiber and including this
The optical fiber transmission line of optical fiber, the optical fiber has W types index distribution or groove-shaped index distribution and makes microbending loss in reality
Reduced in the wave band that border uses.
The technical scheme of solve problem
W types index distribution or groove-shaped index distribution are had according to the optical fiber of the present embodiment, and including central core
With the cladding regions for surrounding central core.Cladding regions have umbilicate type index distribution and at least include：Inner cladding, its encirclement
Central core, and with the low refractive index of the refractive index than central core；And surrounding layer, its surround inner cladding, and with than
The refractive index that the refractive index of central core is low but refractive index of than inner cladding is high.Specifically, central core, inner cladding and outsourcing
Layer is constructed so that the micro-bend wavelength dependence of optical fiber has local maximum, and microbending loss is changed into local maximum
Minimal wave length λ when 10%thIt is longer than 1560nm.
Beneficial effects of the present invention
According to the present embodiment, following optical fiber has been obtained：The optical fiber has W types index distribution or groove-shaped refractive index point
Cloth, and microbending loss is reduced in actually used wave band.
Description of the drawings
Fig. 1 shows the index distribution (W type index distributions) of the optical fiber according to the present embodiment.
(a) and (b) in Fig. 2 shows coefficient of coup C01-CL、C01-11、C11-CLAnd CtotalEach of wavelength
The curve chart of the example of dependency.
Fig. 3 shows the curve chart of the example of the wavelength dependence of the microbending loss of optical fiber.
Fig. 4 shows wavelength XthWith cable cut-off wavelength λccRelation view.
Fig. 5 shows the configuration of each sample in the sample 1 to 10 according to the present embodiment and the table of each characteristic
Lattice.
Fig. 6 shows index distribution (the groove-shaped refractive index point of the optical fiber of the first modified example according to the present embodiment
Cloth).
Fig. 7 shows the index distribution (change of W type index distributions of the optical fiber of the second modified example according to the present embodiment
Type).
Fig. 8 shows the configuration of each sample in the sample 11 to 20 according to the present embodiment and the table of each characteristic
Lattice.
Fig. 9 shows the view including the optical fiber according to the present embodiment as the optical communication system 1 of optical transmission line.
Specific embodiment
[descriptions of embodiments of the invention]
First, will individually enumerate and describe various aspects of the invention.
(1) W types index distribution or groove-shaped index distribution are had according to the optical fiber of the present embodiment.Index distribution by
The cladding regions of central core and encirclement central core are constituted, and cladding regions have umbilicate type index distribution.According to this enforcement
The one side of example, when optical fiber has W type index distributions, cladding regions include：Inner cladding, it has than central core
The low refractive index of refractive index；And surrounding layer, it surrounds inner cladding, and with lower than the refractive index of central core but compare inner cladding
The high refractive index of refractive index.In addition, according to the one side of the present embodiment, when optical fiber has groove-shaped index distribution,
Cladding regions can also include base portion in addition to including inner cladding and surrounding layer, the centrally disposed core of base portion and inner cladding it
Between.Base portion has lower than the refractive index of central core but higher than the refractive index of inner cladding refractive index.Even if when optical fiber has W types
During arbitrary index distribution in index distribution and groove-shaped index distribution, the wavelength dependence tool of the microbending loss of optical fiber
There is a local maximum, and minimal wave length λ of microbending loss when being changed into the 10% of local maximumthIt is longer than 1560nm.
(2) according to the one side of the present embodiment, ITU-T G.650.1 defined in cable cut-off wavelength be preferably
More than 1710nm.According to the one side of the present embodiment, the local maximum of microbending loss is preferably below 0.6dB/km.Root
According to the one side of the present embodiment, the effective cross section product when wavelength is 1550nm is preferably 110 μm2Above and 165 μm2
Below.
(3) according to the one side of the present embodiment, the diameter 2a of central core is preferably more than 12.0 μm and 16.0 μm
Hereinafter, the refractive index contrast between inner cladding and central core is preferably more than 0.30% and less than 0.55%, inner cladding
External diameter 2b and ratio b/a of diameter 2a of central core be preferably more than 2.5 times and less than 5.5 times, and inner cladding with
Refractive index contrast between surrounding layer is preferably more than 0.01% and less than 0.20%.In this manual, with refraction
Rate naRegion with have refractive index nbRegion between refractive index contrast defined by following expression：|na 2-nb 2|/2na 2
× 100 (%).
(4) according to the one side of the present embodiment, the depression that central core preferably includes ring portion and surrounded by ring portion
Portion, the depressed part is present in the center of central core, and with the low refractive index of the refractive index than ring portion.In addition, according to this reality
Apply the one side of example, ratio a/d of the diameter 2d of diameter (matching with the external diameter of the ring portion) 2a and depressed part of central core
Preferably more than 2.0 times and less than 4.0 times, and the refractive index contrast between ring portion and depressed part is preferably 0.02%
Above and less than 0.20%.
(5) according to the one side of the present embodiment, in the optical fiber transmission line including one or more transmission line elements
In, each transmission line element is respectively provided with the structure identical structure with the optical fiber according to each side, preferably transmission line unit
Part transmits the flashlight of any wavelength in actually used wave band.According to the one side of the present embodiment, actually used ripple
Section is preferably one or more the continuous wave bands in the range of 1520nm to 1625nm.According to a side of the present embodiment
Face, the wavelength of flashlight is preferably shorter than wavelength Xth。
Cited each side can apply to each in remaining aspect in [descriptions of embodiments of the invention] part
Individual aspect or all combinations in terms of remaining.
[details of embodiments of the invention]
Next, refer to the attached drawing is described in detail to ad hoc structure of the invention.However, the invention is intended to not
It is limited to following exemplary embodiments, and the present invention including the institute in the range of falling into appended claims and its equivalents
There is change.
Fig. 1 shows W types index distribution as the index distribution of the optical fiber according to the present embodiment.According to the present embodiment
Optical fiber have：Central core；Inner cladding, it surrounds central core；And surrounding layer, it surrounds inner cladding.The folding of inner cladding
Penetrate refractive index of the rate less than central core.The refractive index of surrounding layer is less than the refractive index of central core but higher than the refraction of inner cladding
Rate.As shown in figure 1, the diameter of central core is set to 2a, and the external diameter of inner cladding is set to 2b.In addition, inner cladding with
Refractive index contrast between central core is set to Δ 1, and the refractive index contrast between inner cladding and surrounding layer is set
It is set to Δ 2.
In the optical fiber, basic mode (LP01 moulds) may be with higher mode (especially LP11 moulds) or covering mode coupling.In basic mode
After high order mode coupling, higher mode may further with covering mode coupling.Because basic mode and the high order in addition to LP11 moulds
The coupling of mould is sufficiently small, it is possible to only consider LP11 moulds as higher mode.
The microbending loss of optical fiber becomes loss because of intermode optical coupling, and the main cause of intermode optical coupling occurs
For the random micro-bend of optical fiber.Coefficient of coup C between certain first mould and another second mould1-2With following formula (1) table
Show.Here, each of the first mould and the second mould are arbitrary in basic mode (LP01 moulds), higher mode (LP11 moulds) and cladding mode
Person.λ is wavelength.β1For the propagation constant of the first mould.Ψ1For the field distribution of the first mould.β2For the propagation constant of the second mould.Ψ2For
The field distribution of the second mould.R is the variable of the distance radially for representing the centre axis from optical fiber.θ is represented around optical fiber
Central axis position variable.K and p are fitting parameters.For example, K=p=2.8 is met.
The coefficient of coup of (LP01 moulds) and cladding mode between basic mode is set to C01-CL, basic mode (LP01 moulds) and higher mode
The coefficient of coup between (LP11 moulds) is set to C01-11, and coefficient of coup quilt of the higher mode (LP11 moulds) and cladding mode between
It is set as C11-CL.Coefficient of coup C01-CL、C01-11And C11-CLRepresented with above expression formula (1), and for the function of wavelength.Due to light
Fine is random micro-bend, and the basic mode of spread fiber may directly be changed into cladding mode, consequently, it is possible to leaking.In addition, basic mode may
It is changed into cladding mode via higher mode, consequently, it is possible to leaking.Therefore, when in view of basic mode directly or indirectly with cladding mode coupling
The coefficient of coup C during situation of conjunction, between basic mode and cladding modetotalRepresented with following formula (2).
Ctotal=C01-CL+C01-11C11-CL (2)
(b) in (a) and Fig. 2 in Fig. 2 shows coefficient of coup C01-CL、C01-11、C11-CLAnd CtotalEach of
Wavelength dependence example curve chart.Specifically, (b) in Fig. 2 is the zoomed-in view of the region A of (a) in Fig. 2.
In addition, in (a) in fig. 2, the wave-length coverage of 1200nm to 2000nm is divided into four wavelength regions (I) to (IV).
In wavelength region (I) (the about 1600nm area below in (a) in Fig. 2), between basic mode and cladding mode
Coefficient of coup C01-CLIt is very small, and the coefficient of coup C between higher mode and cladding mode11-CLAlso it is less.Therefore, micro-bend damage
Consumption is minimum.
It is high in wavelength region (II) (that is, about more than 1600nm and 1720nm area below in (a) in Fig. 2)
Coefficient of coup C between secondary mould and cladding mode11-CLIt is quick to become big.Therefore, in wavelength region (II), microbending loss quickly increases
Greatly.
It is high in wavelength region (III) (about more than 1720nm and 1880nm area below in (a) in fig. 2)
Refractive index of the effective refractive index of secondary mould less than surrounding layer.As a result, all higher modes are all changed into cladding mode, and leak.So
And, because the coefficient of coup C between basic mode and higher mode01-11Diminish, so microbending loss also reduces.
In wavelength region (IV) (that is, the region of about more than the 1880nm in (a) in Fig. 2), basic mode and cladding mode it
Between coefficient of coup C01-CLBecome big.Therefore, in wavelength region (IV), microbending loss increase.
Therefore, coefficient of coup CtotalThere is local maxima near the border of wavelength region (II) and wavelength region (III)
Value, and there is minima near the border of wavelength region (III) and wavelength region (IV).
Fig. 3 shows the curve chart of the example of the wavelength dependence of the microbending loss of optical fiber.As shown in figure 3, micro-bend damage
The wavelength dependence of consumption has and the coefficient of coup C shown in (b) in (a) and Fig. 2 in Fig. 2totalWavelength dependence it is identical
Trend.That is, near the wavelength of 1720nm, coefficient of coup CtotalFor maximum (in (a) and Fig. 2 in Fig. 2
(b)), and microbending loss is also maximum (Fig. 3).So, the wavelength dependence of the microbending loss of optical fiber has local maximum.This
In, minimal wave length when microbending loss is changed into the 10% of local maximum is set to λth。
Microbending loss is measured as follows.The reel of a diameter of 400mm is prepared, a diameter of 50 used in reel
μm silk screen surface is covered with 100 μm of spacing, and when with the tension force of 80g by optical fibre winding on the reel when, measurement
As the microbending loss of loss increment.The microbending loss measured by the measuring method is preferably below 1.0dB/km.
Therefore, the wavelength dependence of microbending loss depends on the coupling between basic mode, higher mode and cladding mode.Higher mode
It is cable cut-off wavelength that leakage loss increases and propagates wavelength when interrupting.Therefore, cable cut-off wavelength is suitably designed, so as to
Can be by wavelength XthIt is extended for being longer than actually used wave band, and microbending loss can be reduced.Actually used wave band be
The wave band being usually used in optic communication, and for example, C-band (1530nm to 1565nm) or L-band (1565nm to 1625nm).
Therefore, in the optical fiber according to the present embodiment, wavelength XthIt is longer than 1560nm.
Fig. 4 shows wavelength XthWith cable cut-off wavelength λccRelation view.As can be seen from Figure 4, in order that wavelength Xth
It is extended for being longer than actually used wave band, when assuming to be used in C-band, cable cut-off wavelength λccPreferably 1710nm with
On, and when assuming to be used in L-band, cable cut-off wavelength λccPreferably more than 1760nm.If λccBeing longer than actually makes
With wavelength, then higher mode can also be limited in core and can propagate.If however, λccIt is longer than actually used wavelength, then
Single mode operation can generally be performed.
(b) in (a) and Fig. 2 from Fig. 2 is as can be seen that when the local maximum of microbending loss reduces, it is considered that
LP01 moulds are faint with the coupling of LP11 moulds.Therefore, even if working as cable cut-off wavelength λccWhen being longer than actually used wavelength, in reality
Lay in the state of optical cable as submarine optical fiber cable or ground optical cable on border, the local maximum of microbending loss is preferably
0.6dB/km, generally to carry out single mode operation, and suppresses the increase of loss.
In addition, if cable cut-off wavelength λccExcessively increase, the then restriction to the higher mode in addition to LP11 moulds also becomes
By force.Similar with the LP01 moulds that will become basic mode, the LP02 moulds of higher mode have the magnetic distribution shape similar with Gaussian function
Shape, and LP01 moulds and LP02 moulds easily couple.In order to anti-stop signal is deteriorated because of the coupling of LP01 moulds and LP02 moulds, LP02 moulds
Theoretical cutoff wavelength be preferably shorter than actually used wavelength.
Fig. 5 shows the configuration of each sample in the sample 1 to 10 according to the optical fiber of the present embodiment and each is special
The form of property.The optical fiber of each sample in sample 1 to 10 has the W type index distributions shown in Fig. 1.In the table successively
Describe when radius of curvature R is set to 10mm：Refractive index contrast Δ 1, interior bag between inner cladding and central core
The diameter of the diameter 2a, the external diameter of inner cladding and central core of the refractive index contrast Δ 2, central core between layer and surrounding layer
Ratio b/a, wavelength be 1550nm when effective cross section product Aeff, cable cut-off wavelength λcc, microbending loss be changed into local most
Big value 10% when minimal wave length λth, LP02 moulds theoretical cutoff wavelength, wavelength be 1550nm when microbending loss and
Bending loss when wavelength is 1550nm.
There are many index distributions to can apply to the optical fiber according to the present embodiment in addition to W type index distributions.
For example, Fig. 6 shows the index distribution (groove-shaped index distribution) of the optical fiber of the first modified example according to the present embodiment, and
And can more effectively suppress microbending loss.That is, the optical fiber with the groove-shaped index distribution shown in Fig. 6 includes：
Central core；Base portion, it surrounds central core；Inner cladding, it surrounds base portion；And surrounding layer, it surrounds inner cladding.Central core
Portion has diameter 2a, and the refractive index of central core is higher than the refractive index of base portion and surrounding layer.In addition, the refractive index of inner cladding
It is lower than the refractive index of base portion and surrounding layer.The refractive index of base portion and surrounding layer is substantially matching each other.Inner cladding and central core it
Between refractive index contrast be Δ 1, and the refractive index contrast and inner cladding between inner cladding and surrounding layer and base portion it
Between refractive index contrast all be Δ 2.Even if in the optical fiber with above-mentioned index distribution, microbending loss is changed into local maxima
Value 10% when lowest wavelength λthCan be set to be longer than 1560nm.
Effective cross section product Aeff when wavelength is 1550nm is preferably 110 μm2Above and 165 μm2Below.In addition,
The diameter 2a of central core is preferably less than 12.0 μm and more than 16.0 μm, the relative between inner cladding and central core
Ratio b/a of rate difference Δ 1 preferably more than 0.30% and less than 0.55%, the external diameter of inner cladding and the diameter of central core is excellent
Selection of land is more than 2.5 times and less than 5.5 times, and the refractive index contrast Δ 2 between inner cladding and surrounding layer is preferably
More than 0.01% and less than 0.20%.
Fig. 7 shows the index distribution (change of W type index distributions of the optical fiber of the second modified example according to the present embodiment
Type).Index distribution shown in Fig. 7 is with the difference of the index distribution shown in Fig. 1：Central core include ring portion with
And depressed part, depressed part is surrounded by ring portion, and is present in the center of central core.Refraction of the refractive index of depressed part less than ring portion
Rate.As shown in fig. 7, the refractive index contrast that the diameter of depressed part is set between 2d, and depressed part and ring portion is set
For Δ 1'.Even if most short when microbending loss is changed into the 10% of local maximum in the optical fiber with above-mentioned index distribution
Wavelength XthCan be set to be longer than 1560nm.In addition, in the optical fiber with the index distribution shown in Fig. 7, having in increase
With relatively reduced mode field diameter MFD, and can reduce and (for example, be based on other optical fiber while effect cross-sectional area A eff
ITU-T optical fiber G.652) junction loss.
Fig. 8 shows the configuration of each sample in the sample 11 to 20 according to the optical fiber of the present embodiment and each is special
The form of property.The optical fiber of each sample in sample 11 to 20 has the index distribution shown in Fig. 7.Retouch successively in the table
State when radius of curvature R is set to 10mm：Refractive index contrast Δ 1, depressed part and ring between inner cladding and core
Relative index of refraction Δ 1' between portion, the refractive index contrast Δ 2, central core between inner cladding and surrounding layer diameter (with
The external diameter of ring portion matches) ratio b/a of diameter of 2a, the external diameter of inner cladding and central core, the diameter of central core with it is recessed
Ratio a/d, the effective cross section product Aeff when wavelength is 1550nm between the diameter in sunken portion, cable cut-off wavelength λcc, it is micro-
Curved loss is changed into minimal wave length λ during the 10% of local maximumth, LP02 moulds theoretical cutoff wavelength, wavelength be 1550nm
When microbending loss and wavelength be 1550nm when bending loss.The ratio of the diameter of central core and the diameter of depressed part
A/b is preferably more than 2.0 times and less than 4.0 times, and the refractive index contrast Δ 1' between ring portion and depressed part is preferably
For more than 0.02% and less than 0.20%.
Fig. 9 shows the view including optical fiber of the invention as the optical communication system 1 of optical transmission line.Light leads to
Letter system 1 transmits flashlight to receptor 30 via repeater 20 from emitter 10.Lay the optical fiber 40 according to the present embodiment
As between the repeater 20 of emitter 10 and primary, between certain repeater 20 and the repeater 20 of secondary and most
The optical transmission line (transmission line element) of transmission signal light between ultimate repeater 20 and receptor 30.These transmission lines
Element can be arranged abreast.
Index distribution shown in Fig. 1, Fig. 6 or Fig. 7 is also applied to the light as optical transmission line according to the present embodiment
Fine 40.Fibre optic construction is that, so that the wavelength dependence of microbending loss has a local maximum, and microbending loss is changed into local most
Big value 10% when minimal wave length be longer than 1560nm.As a result, it is possible to reduce the microbending loss of actually used wave band.Therefore,
The optical communication system 1 applied as optical transmission line according to the optical fiber 40 of the present embodiment can be effectively improved
The optic communication of OSNR.
Reference numerals list
1... optical communication system, 10... emitters, 20... repeaters, 30... receptors, 40... optical fiber transmission lines.
Claims (11)
1. a kind of optical fiber, including：
Central core；
Inner cladding, it surrounds the central core, and with the refractive index lower than the refractive index of the central core；And
Surrounding layer, it surrounds described inner cladding, and with lower than the refractive index of the central core but than the inner cladding
The high refractive index of the refractive index,
Wherein, the central core, the inner cladding and the surrounding layer are constructed so that the ripple of the microbending loss of the optical fiber
Long range dependent has a local maximum, and minimal wave length λ of microbending loss when being changed into the 10% of the local maximumth
It is longer than 1560nm.
2. optical fiber according to claim 1, also includes：
Base portion, it is located between the central core and the inner cladding, and with the refractive index than the central core
Low but higher than the refractive index of inner cladding refractive index.
3. optical fiber according to claim 1 and 2,
Wherein, the optical fiber has the cable cut-off wavelength of more than 1710nm.
4. optical fiber according to any one of claim 1 to 3,
Wherein, the local maximum is below 0.6dB/km.
5. optical fiber according to any one of claim 1 to 4,
Wherein, the optical fiber has 110 μm when wavelength is 1550nm2Above and 165 μm2Following effective cross section product.
6. optical fiber according to any one of claim 1 to 5,
Wherein, a diameter of more than 12.0 μm and less than 16.0 μm of the central core,
Refractive index contrast between the inner cladding and the central core is more than 0.30% and less than 0.55%,
The ratio of the diameter of the external diameter of the inner cladding and the central core is more than 2.5 times and less than 5.5 times, and
Refractive index contrast between the inner cladding and the surrounding layer is more than 0.01% and less than 0.20%.
7. optical fiber according to claim 6,
Wherein, the central core includes ring portion and the depressed part surrounded by the ring portion, and the depressed part is present in described
The center of central core simultaneously has the refractive index lower than the refractive index of the ring portion.
8. optical fiber according to claim 7,
Wherein, the ratio of the diameter of the external diameter of the ring portion and the depressed part is more than 2.0 times and less than 4.0 times, and
Refractive index contrast between the ring portion and the depressed part is more than 0.02% and less than 0.20%.
9. a kind of optical fiber transmission line, including：
One or more transmission line elements, each described transmission line element have with according to any one of claim 1 to 8
The structure identical structure of described optical fiber,
Wherein, the transmission line element transmits the flashlight of any wavelength in actually used wave band.
10. optical fiber transmission line according to claim 9,
Wherein, the actually used wave band is one or more the continuous wave bands in the range of 1520nm to 1625nm.
11. optical fiber transmission lines according to claim 10,
Wherein, the wavelength of the flashlight is shorter than λth。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-174046 | 2014-08-28 | ||
| JP2014174046 | 2014-08-28 | ||
| PCT/JP2015/074172 WO2016031901A1 (en) | 2014-08-28 | 2015-08-27 | Optical fiber and optical fiber transmission path |
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| Publication Number | Publication Date |
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| CN106662704A true CN106662704A (en) | 2017-05-10 |
| CN106662704B CN106662704B (en) | 2019-07-12 |
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| Country | Link |
|---|---|
| US (1) | US9977183B2 (en) |
| EP (1) | EP3187914B1 (en) |
| JP (1) | JP6717194B2 (en) |
| CN (1) | CN106662704B (en) |
| DK (1) | DK3187914T3 (en) |
| WO (1) | WO2016031901A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019138848A1 (en) * | 2018-01-11 | 2019-07-18 | Sumitomo Electric Industries, Ltd. | Optical fiber, coated optical fiber, and optical transmission system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3438715B1 (en) * | 2016-04-01 | 2024-04-24 | Fujikura Ltd. | Method for manufacturing an optical fiber |
| US10983267B2 (en) * | 2018-03-08 | 2021-04-20 | Corning Incorporated | Quasi-single-mode optical fiber |
| EP3923045A4 (en) * | 2019-02-05 | 2022-11-16 | Furukawa Electric Co., Ltd. | Optical fiber |
| JP7019617B2 (en) | 2019-02-07 | 2022-02-15 | 古河電気工業株式会社 | Optical fiber and manufacturing method of optical fiber |
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| US8693834B2 (en) * | 2011-08-15 | 2014-04-08 | Corning Incorporated | Few mode optical fibers for mode division multiplexing |
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2015
- 2015-08-27 DK DK15836456.2T patent/DK3187914T3/en active
- 2015-08-27 WO PCT/JP2015/074172 patent/WO2016031901A1/en active Application Filing
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| CN1306628A (en) * | 1999-03-31 | 2001-08-01 | 株式会社藤仓 | Multimode optical fiber with high-order mode removing function |
| JP2003262752A (en) * | 1999-08-12 | 2003-09-19 | Fujikura Ltd | Optical fiber and optical transmission system |
| CN1432829A (en) * | 2002-01-15 | 2003-07-30 | 住友电气工业株式会社 | Optical fiber, fiber belt, fiber cable and light connector with fiber |
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| WO2019138848A1 (en) * | 2018-01-11 | 2019-07-18 | Sumitomo Electric Industries, Ltd. | Optical fiber, coated optical fiber, and optical transmission system |
| JP2019120894A (en) * | 2018-01-11 | 2019-07-22 | 住友電気工業株式会社 | Optical fiber, coated optical fiber, and optical transmission system |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3187914A4 (en) | 2017-08-02 |
| WO2016031901A1 (en) | 2016-03-03 |
| CN106662704B (en) | 2019-07-12 |
| US9977183B2 (en) | 2018-05-22 |
| US20170131468A1 (en) | 2017-05-11 |
| JPWO2016031901A1 (en) | 2017-06-15 |
| EP3187914B1 (en) | 2018-10-24 |
| DK3187914T3 (en) | 2018-12-17 |
| JP6717194B2 (en) | 2020-07-01 |
| EP3187914A1 (en) | 2017-07-05 |
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